Speedometer recalibration - The 1947 - Present Chevrolet & GMC Truck Message Board Network

'65 chevy lover · 03-13-2019, 12:44 PM

I installed a TH400 in my '65 c10 and, as a result, the speedometer was way off. Some people here posted some places to get the parts to recalibrate it. But I was totally unsure of my mechanical skills to fix it. I recently met a guy that knew a place that can recalibrate it. It's in Weatherford, TX. A link is posted below.

www.phoenixtrans.com

**Clyde65** · 03-13-2019, 04:22 PM

Pheonix is awesome!

**damnyankee36** · 03-13-2019, 08:55 PM

I have to ask; did you install the correct speedometer gears?

'65 chevy lover · 03-17-2019, 02:09 PM

Quote:

Originally Posted by damnyankee36

I have to ask; did you install the correct speedometer gears?

I haven't been there yet. Only talked to the guy on the phone.

**damnyankee36** · 03-17-2019, 03:33 PM

Yeah, I'm sure you could get within 1-2MPH with the correct gears.

'65 chevy lover · 03-17-2019, 08:31 PM

The trick is though, at least in my case, is knowing which gears to buy(the first time). They guy told me there are two different types, one of them that has to be pressed off and back on(if I remember correctly, it's been a couple weeks). IMHO, I'd rather take them my truck and have them do it and then just go back and get it when they're done. But that's just me. YMMV.

**damnyankee36** · 03-17-2019, 09:36 PM

OK, I see where you're coming from. I thought all they were gonna do is attempt to just calibrate the speedometer. It is a bit of PITA to change the drive gear cuz you have remove the tail shaft.

03-13-2019, 12:44 PM	#1
'65 chevy lover Registered User Join Date: Apr 2011 Location: Ft. Worth, Tx Posts: 536	Speedometer recalibration I installed a TH400 in my '65 c10 and, as a result, the speedometer was way off. Some people here posted some places to get the parts to recalibrate it. But I was totally unsure of my mechanical skills to fix it. I recently met a guy that knew a place that can recalibrate it. It's in Weatherford, TX. A link is posted below. www.phoenixtrans.com

03-13-2019, 04:22 PM	#2
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: Speedometer recalibration Pheonix is awesome! __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

03-13-2019, 08:55 PM	#3
damnyankee36 Senior Member Join Date: Sep 2002 Location: Alamogordo, NM Posts: 724	Re: Speedometer recalibration I have to ask; did you install the correct speedometer gears?

03-17-2019, 03:33 PM	#5
damnyankee36 Senior Member Join Date: Sep 2002 Location: Alamogordo, NM Posts: 724	Re: Speedometer recalibration Yeah, I'm sure you could get within 1-2MPH with the correct gears.

03-17-2019, 08:31 PM	#6
'65 chevy lover Registered User Join Date: Apr 2011 Location: Ft. Worth, Tx Posts: 536	Re: Speedometer recalibration The trick is though, at least in my case, is knowing which gears to buy(the first time). They guy told me there are two different types, one of them that has to be pressed off and back on(if I remember correctly, it's been a couple weeks). IMHO, I'd rather take them my truck and have them do it and then just go back and get it when they're done. But that's just me. YMMV.

03-17-2019, 09:36 PM	#7
damnyankee36 Senior Member Join Date: Sep 2002 Location: Alamogordo, NM Posts: 724	Re: Speedometer recalibration OK, I see where you're coming from. I thought all they were gonna do is attempt to just calibrate the speedometer. It is a bit of PITA to change the drive gear cuz you have remove the tail shaft.

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